Home / 21,168.18-29,203.88-13,613.54

Finding the Fourth Proportional to 21,168.18, 29,203.88 and 13,613.54

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Solution

The fourth proportional to 21,168.18, 29,203.88 and 13,613.54 is: 18,781.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,168.18 : 29,203.88 = 13,613.54 : x
  2. Step 2: Convert to fraction form
    21,168.18/29,203.88 = 13,613.54/x
  3. Step 3: Cross multiply
    21,168.18x = 29,203.88 × 13,613.54
  4. Step 4: Simplify right side
    21,168.18x = 397,567,974.45
  5. Step 5: Solve for x
    x = 397,567,974.45/21,168.18
  6. Step 6: Final answer
    x = 18,781.40

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.